Magneto-electric telephone-call



(No model.)

G. A. WILKINS. MAGNETO ELECTRIC TELEPHONE GALL.

A No. 361,737. Patented Apr. 26, 1887.

lllllllllll llllllllll Illllllll -UNITED STATES PATENT OFFICE.

GEORGE A. VILKINS, OF PHILADELPHIA, PENNSYLVANIA.

MAGNETO-ELECTRICKTELEPHONE-CALL.

SPECIFICATION forming part of Letters Patent No. 361,737, dated April 26, 1887.

Application filed April 16, 1884.

-tain new and useful Improvements in Telephone-Calls, of which the following is a speciflcatiOn. Y

In most cases as now used'in telephone systems the magneto calling apparatus is placed in a box and located above the transmitter upon a base-board, which is usually attached to the wall of the room. This makes it necessary for the subscriber to leave his desk and proceed to the telephone-instruments, and it often happens that he is unable to make irnmediate connection with the desired party,

` owi ng to many well-understood causes, and he has to remain standing for some time, or return from his seat again and again. Some attempts have been made to obviate this 0bjection by attaching the telephone-instruments Y to the desk or to a swinging standard attached to the desk, so that the calling and telephone instruments can be swung around into a position to be used without leaving ones seat.

My invention relates to this class of telephone-calls, and has for itsobject to provide a simple, compact, and effectual apparatus, which may be placed upon the desk of the subscriber, or in convenient proximity to the desk,

'and adapted to be operated by the subscriber Vview o'f the signaling or call apparatus. Fig.

2 is a vertical section of the same. Fig. 3 is a horizontal section. Fig. 5 shows the call apparatus inclosed in a standard supporting the telephone-instruments. Fig. 4. is a modified form of generator, and Fig. 6 shows a diagram of the circuits.

The magneto-generator may be of any suit- Serial No. 128,176. (No model.)

able construction, that shown consisting, esA sentially, of one or more permanent magnets, A, preferably vin the form of rings, and having inwardly-projecting pole-pieces B, between which is located the armature C, in this instance of the wellknown Siemens form. These magnets are supported and held to- .gether between two plates by rods or bars D,

suitable manner, a hole in the plate E form-v ing a bearing for one end of the armatureshaft G, the other end of which has its step in the plate F.

Ashaft, H, carrying alargebevel gear-wheel, h, has its bearingsin the bracket G and standard I, also secured to the plate F, and a small gearwheel, c, secured to the shaft C', meshes with the gear-wheel h. The ends of the shaft H are squared or otherwise formed so as to be adapted to receive a crank, K, or other device by which the shaft is rotated, and a rapid motion communicated to the armature C by the gears h, and c; also, qupon the plate E is secured a horseshoe electro-magnet, L, having suitable coils upon its poles, and loosely mounted upon the shaft H is a polarized armature, M, adapted to be oscillated thereon bythe magnet, and arranged below, so as to strike the bell N, secured to the standard G. The armature may be provided with lugs or projections, if desired, as indicated in dotted lines, to form bell-hammers, or the ends of the polarized armature may operate directly thereon.

Upon an insulating-piece, O, are the binding-posts a b, the former being provided with a screw, d, and the :latter connected with a spring-piece, e, normally bearing against the screw d, and forming a short circuit, as hereafter explained.

A suitable circuit-breaker may be supported in the standard f, that shown consisting of a pin, W, having an end of insulating material resting upon the spring e and a push-knob at""`^"\ the other end. A

Suitable collecting brushes or connections, k k, bear upon the armature-shaft C', and are electrically connected with the bobbin or coil of the armature and the binding-posts c b of the electro-magnet.

This call apparatus is preferably inclosed in ICO xoT

a case which may form the base of a standard supporting the telephone-instruments, and this may be in any convenient form. As shown, it consists of a hollow base, P, inclosing the call apparatus, having openings on each side for the insertion of the crank K, and an opening for the passage of the circuit-breaking pushbutton, while from the upper part projects an arm, Q, carrying the telephone-instruments The arrangement of circuits is shown diagrammatrcally in Fig. 6, and the operation will readily be understood therefrom. The line in circuit is shown as being connected to any of the ordinary automatic switches that normally cut out the telephones and make connection with the signaling apparatus, the circuit being from the contact or bell bindingpost Z to the coils of the magnet, to the binding-post b, through the spring circuit-breaker e, to post a, and to ground or the next station on the line. In this position the signal apparatus is in condition to receive signals from distant stations and the telephones and generator are cut out of circuit. If the subscriber wishes to signal, he presses the button, breaking the contact between e and d, and operates his generator by the crank, which causes alternating currents to How through the magnetcoils and operate the polarized armature to ring the bell.

A modified form of magnets and arrangement of armature is shown in Fig. 6, the essential features being substantially the same as those above described.

In either case the construction is such as to leave a space in which to put one or more batterycells,0, for operating the telephone-transmitter, and in this connection I prefer to use the chloride-of-silver cel1s,as they occupylittle space and furnish the requisite current.

Various other modifications will be apparent and embraced within the scope of my invention. f

The circuit-breaker, instead of being operated by a push-button, may be automatically operated upon attaching or turning the crank, and the electro-magnet coils may face each other and vibrate an armature located between them. y

By this construction and arrangement of devices it will be seen that I produce a very simple, compact, and durable call apparatus, that is well adapted to be used upon a subscrbers desk,or adjacent thereto, as it allows of use by the subscriber without moving from his seat, and by using the automatic switch the device can be operated by a single hand and from either side.

I claim- 1. A telephone-call apparatus consisting of a magnetogenerator, electro-magnet connected therewith, a bell adjacent to the armature of the magnet, a circuit-breaker, and means for rotating the armature, all supported upon the generator, substantially as described.

2. The combination, with the generator having superposed magnets and an interior vertical armature, of a cap-plate having bearings for the armature and for the shaft, said shaft carrying a bevel-wheel gearing with a bevelpinion on the armature-shaft, an electro-magnet connected with the generator, and an armature therefor arranged between the magnet and bell, substantially as described.

3. The combination of the generator, the cap-plate carrying an electro-magnet and provided with bracket G and standard I, arranged to afford bearings for the armature-shaft C', and driving-shaft H, and to support the bell N, substantially as described.

4. The combination of a generator, electromagnet, bell, driving-shaft H, geared with the armature of the generator, and armature M, of the electro-magnet hung to vibrate upon the shaft H, substantially as described.

5. Atelephone-call provided with a generator having magnets ofasubstantially-circular form and inclosing a spacewithin which is arranged one or more battery-cells, substantially as described.

6. The combination of a stmndard having a hollow base, a magneto call apparatus inclosed therein, and an arm adapted to support the telephoneinstruments, substantially as described.

7. The combination of a hollow base, P, a magneto call inclosed therein,and arm Q, pivotally connected to said base and supporting transmitting and receiving instruments, the whole being adapted for attachment to a desk, substantially as described.

8. The combination, with a horseshoe-magnet having re-entering ends, of an armature located between the ends, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEO. A. VILKINS.

Witnesses:

CHARLES E. FOSTER, L. C. YOUNG.

lOO 

